Book/Report

FZJ-2018-02723

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Berechnung des Wärmeüberganges im Gebiet abgelöster Strömung hinter einer Querschnittserweiterung

Achenbach, E.FZJ* ; Froning, D.FZJ*

1986
Kernforschungsanlage Jülich, Verlag Jülich

Please use a persistent id in citations: http://hdl.handle.net/2128/18380

Report No.: Juel-2106

Abstract: Foreced convective heat transfer from a two-dimensional channel with a sudden expansion on one side is computed. For this reason the vorticity equation and the energy equation as well must be solved. The numerical method applied is the Crank-Nicolson procedure. The influence of the Reynolds number (10 < Re < 2000) and of the Prandtl-number (0,7 < Pr < 2,5) on the flow and heat transfer is considered. With increasing Reynolds number the length of the recirculation zone grows uplevelling out to 11 $\div$ 12 step heights for Re > 1000. The effect of the Prandtl-number on heat transfer can be approximated by the function Pr$^{1/3}$. The theoretical results agree well with those from other authors and from own experiments. The two methods applied to solving the equations of motion show that the implicite procedure is more appropriate for calculations at high Reynolds-numbers. Nevertheless,this advantage is associated with an increase of computing time by about 25 per cent.

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Contributing Institute(s):

1. Publikationen vor 2000 (PRE-2000)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

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Database coverage:

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